diff --git a/src/main/java/de/cismet/cids/server/ws/rest/RESTfulSerialInterfaceConnector.java b/src/main/java/de/cismet/cids/server/ws/rest/RESTfulSerialInterfaceConnector.java
index 9d0c415c..dc1ba71d 100644
--- a/src/main/java/de/cismet/cids/server/ws/rest/RESTfulSerialInterfaceConnector.java
+++ b/src/main/java/de/cismet/cids/server/ws/rest/RESTfulSerialInterfaceConnector.java
@@ -62,6 +62,7 @@
 import de.cismet.cids.server.search.CidsServerSearch;
 import de.cismet.cids.server.ws.SSLConfig;
 
+import de.cismet.cidsx.server.api.types.GenericResourceWithContentType;
 import de.cismet.cidsx.server.search.builtin.legacy.LightweightMetaObjectsByQuerySearch;
 
 import de.cismet.netutil.Proxy;
@@ -2277,7 +2278,20 @@ public Object executeTask(final User user,
             }
 
             try {
-                return getResponsePOST("executeTask", queryParams, Object.class); // NOI18N
+                final Object response = getResponsePOST("executeTask", queryParams, Object.class); // NOI18N
+
+                // ensure backwards compatilbity of RestApiCidsServerAction, unwrap GenericResourceWithContentType
+                if ((response != null) && GenericResourceWithContentType.class.isAssignableFrom(response.getClass())) {
+                    final GenericResourceWithContentType reponseWithContentType = (GenericResourceWithContentType)
+                        response;
+                    if (LOG.isDebugEnabled()) {
+                        LOG.debug("unwrapping response of type '" + reponseWithContentType.getContentType()
+                                    + "' of action '" + taskname + "'");
+                    }
+                    return reponseWithContentType.getRes();
+                }
+
+                return response;
             } catch (final UniformInterfaceException ex) {
                 if (LOG.isDebugEnabled()) {
                     LOG.debug("exception during request, remapping", ex);
diff --git a/src/main/java/de/cismet/cidsx/client/connector/RESTfulInterfaceConnector.java b/src/main/java/de/cismet/cidsx/client/connector/RESTfulInterfaceConnector.java
index b51a0a91..0a88d1c2 100644
--- a/src/main/java/de/cismet/cidsx/client/connector/RESTfulInterfaceConnector.java
+++ b/src/main/java/de/cismet/cidsx/client/connector/RESTfulInterfaceConnector.java
@@ -2355,6 +2355,7 @@ public Object executeTask(final User user,
                         + webResource.toString());
         }
 
+        // FIXME: Fails if the action does nor return APPLICATION_JSON
         builder.type(MediaType.MULTIPART_FORM_DATA_TYPE).accept(MediaType.APPLICATION_JSON_TYPE);
 
         FormDataMultiPart multiPartData = new FormDataMultiPart();
@@ -2423,6 +2424,7 @@ public Object executeTask(final User user,
                         + taskResult.getContentType() + "'");
         }
 
+        // TODO: unwrap / deserialize result depending on conent type!
         return taskResult.getRes();
     }